Agnatha genera

Lampetra is a genus of lampreys in the family Petromyzontidae.

Mordacia is a genus of lamprey, the sole genus of the family Mordaciidae, also known as the southern topeyed lampreys.

thumb|255px|Drawing of Eptatretus cirrhatus Eptatretus is a large genus of hagfish.

Eudontomyzon is a genus of lamprey in the family Petromyzontidae. Most species are found in Eastern Europe.

thumb|Southern hagfish (Myxine australis) mid-19th century drawing by Günther

Lethenteron is a genus of lamprey in the family Petromyzontidae.

Ichthyomyzon is a genus of lampreys in the family Petromyzontidae, native to North America.

Entosphenus is a genus of lampreys.

Caspiomyzon is a genus of lamprey in the family Petromyzontidae. They are native to Eastern Europe and parts of Western and Central Asia. Two of the three species in the genus are endemic to Greece.

Tetrapleurodon is a genus of lampreys that are endemic to the Lerma–Chapala basin in west–central Mexico. Both species are threatened.

Nemamyxine is a genus of hagfish.

Geotria is the only genus in the lamprey family Geotriidae. It has 2 known species: Geotria australis (pouched lamprey) and Geotria macrostoma (Argentinian lamprey). Both species were considered conspecific until G. macrostoma was revived in a 2020 study.

Neomyxine is a genus of hagfish found in the Pacific Ocean around New Zealand.

Rubicundus is a genus of hagfishes, the only extant member of the subfamily Rubicundinae. All species in it were formerly classified in Eptatretus. R. eos, R. lakeside, and R. rubicundus are known from single specimens caught in the Tasman Sea, Galápagos, and Taiwan, respectively. They are named after the distinctive red coloration that all species share.